GEOLOGY 1 Lecture Notes - Lecture 30: East Los Angeles College, Seismic Wave, Elastic-Rebound Theory
Document Summary
Seismic waves travel differently through different rock materials. Propagate faster through dense and solid rocks. Materia amplification: intensity (amplitude of vertical movement) of ground shaking more severe in unconsolidated materials. Seismic energy is attenuated more and propagates less distance. Ground motion is related to the amplitude of seismic waves and its accelerations. Measured by accelometers in terms of the acceleration of gravity. M 6 to m 6. 9 can have a . 3 to . 7 g. Structure design target to withstand . 6 to 7 g. Occurs when the propagation of rupture is faster than the velocity of shear waves or surface waves produced by the rupture, analogous to supersonic aircraft producing a sonic boom. Produce shock waves that produce strong round motion along the fault resulting in significant damage. Most commonly occurs with earthquakes that rupture a long straight fault segment (strike-slip) Loss of life and collapse of infrastructure. Deformation of the ground surface: tilting, elevation changes.
